Make Objects Appear and Disappear Blender 2.9
You can mix the material of your object with a Transparent Shader, using a Value Node sent through a Greater Than (Math) Node with the threshold set to 156 (your desired frame) as a Mix Factor. You can then give the Value Node the value of #frame (just click the field and type it in), which will make it provide the value of whatever frame you are at. Your object will be transparent up until frame 156, at which point it will become visible.